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Multiple Small Subs - Geddes Approach
Multiple Small Subs - Geddes Approach
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Old 14th February 2020, 10:58 AM   #2241
AllenB is offline AllenB  Australia
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Multiple Small Subs - Geddes Approach
That top one looks like it might be diverting rather than returning.
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Old 14th February 2020, 05:29 PM   #2242
gedlee is offline gedlee  United States
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Remove the top one and add #11.
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Old 14th February 2020, 05:57 PM   #2243
beige is offline beige  Europe
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Okay, you mean those four then?
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Old 14th February 2020, 06:03 PM   #2244
gedlee is offline gedlee  United States
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Yes, but this is not a big deal, just something interesting that I noted in the data.
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Old 14th February 2020, 06:10 PM   #2245
beige is offline beige  Europe
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Sure, I believe what you said.
I find this very interesting since my knowledge is basic and I'd like to expand it. Hence so many questions.
It's interesting that these anomalies are seen at room mode frequencies.
Could this be more plausible explanation?
I can't imagine how sound could travel outside of the roomand then return and cause this on the graph ... But than again, what do I know.
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Old 15th February 2020, 12:59 AM   #2246
gedlee is offline gedlee  United States
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Quote:
Originally Posted by beige View Post
sound could travel outside of the room and then return and cause this on the graph
Replace the underlined word with "can" and you have it!
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Old 15th February 2020, 07:33 AM   #2247
DAMIC is offline DAMIC  Serbia
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Hi,

Have 4 subs randomly placed in my room. Through years tried everything up today, but the best sound and spl curve have with 3 pcs (BR) LPF at 50Hz 24LR and fourth at 60Hz (sealed, in counter phase). Main speakers are with HPF at 100Hz 24LR. System is active with two 4-way electronic xo/dsp.

There are only 3 PEQ's on three BR subs. No shelving or other correction applied including delay, except low cuts. Fourth sealed sub is without correction. Subs are in "stereo", found no difference between mono and stereo. IME, lesser number of dsp correction give better sound.

I repeat, have the best bass ever, but wonder, are there theoretical issues with this setting.

My measurements (REW mdat's) are at this moment on other PC what is out of order.

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Old 15th February 2020, 08:39 AM   #2248
beige is offline beige  Europe
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Quote:
Originally Posted by gedlee View Post
Replace the underlined word with "can" and you have it!
Is seeing these anomalies at room modes a coincidence?
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Old 15th February 2020, 06:48 PM   #2249
gedlee is offline gedlee  United States
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Quote:
Originally Posted by DAMIC View Post
Hi,

Have 4 subs randomly placed in my room. Through years tried everything up today, but the best sound and spl curve have with 3 pcs (BR) LPF at 50Hz 24LR and fourth at 60Hz (sealed, in counter phase). Main speakers are with HPF at 100Hz 24LR. System is active with two 4-way electronic xo/dsp.

My measurements (REW mdat's) are at this moment on other PC what is out of order.

Thanks for reply
Seems to me that you should have a big hole between 60 Hz and 100 Hz.

Again, I do not recommend crossovers to subs.

Without measurements I can't comment further, but if it all works then that's what counts.
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Old 15th February 2020, 06:50 PM   #2250
gedlee is offline gedlee  United States
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Quote:
Originally Posted by beige View Post
Is seeing these anomalies at room modes a coincidence?
Since it has been in every one of your measurements, I doubt that it is a coincidence. It's real, but probably very obscure as to its origin. And since it is meaningless just ignore it.
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